Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation

Details Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation

2011-11-11

arxiv.org/abs/1111.2835v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures, 1 table

Scientific paper

We study the spectra of gamma ray signals that arise from dark matter annihilation in the universe. We focus on the large class of theories where the photon spectrum includes both continuum spectrum of gamma rays that arise from annihilation into Standard Model states at tree level, as well as monochromatic gamma rays arising from annihilation directly into two photons at the one loop level. In this class of theories we obtain lower bounds on the ratio of the strength of the gamma ray line relative to the gamma ray continuum as a function of the dark matter mass and spin. These limits are obtained from the unitarity relation between the tree level amplitude of the primary annihilation channel and the imaginary part of the loop level amplitude for annihilation directly into photons, with the primary decay products running in the loop. These results are exact in the limit that dark matter annihilation is exclusively to a single Standard Model species, occurs through the lowest partial wave and respects CP. Away from this limit the bounds are approximate. Our conclusions agree with the known results in the literature in the case of the Minimal Supersymmetric Standard Model (MSSM). We use the Fermi-LAT observations to translate these limits into upper bounds on the dark matter annihilation cross section into any specific Standard Model state.

Affiliated with

Also associated with

No associations

Rating

Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lower Limits on the Strengths of Gamma Ray Lines from WIMP Dark Matter Annihilation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-140256